Mitsubishi 3000GT Service Manual page 882

SERVICE BRAKES
Code No. 51 ABS valve relay system
ABS-ECU monitors solenoid valve drive circuit at all times. When 5 or more solenoids
are not energized with solenoid valve turned ON by ABS-ECU or when 5 or more
solenoids are kept energized with solenoid valve turned OFF by ABS-ECU, ABS
valve is judged to be in trouble and output is provided.
Check ABS valve relay.
(Refer to P.35-83.)
Measure at ABS valve relay
connector A-80.
Disconnect connectors and
l
make measurements on har-
ness side.
Voltage between terminal No. 5
l
and body ground
Measure at ABS-ECU connector
E-12.
Disconnect connectors and
l
make measurements on har-
ness side.
Resistance between 82-47
l
Check solenoid valve.
(Refer to P.35-112.)
make measurements on har-
ness side.
terminals
HU side ABS-ECU side
3 78
7 50
31
4
59
8
1 30
5 58
2 79
6 51
OK
Measure at HU connector A-65 and
ABS valve relay connector A-80.
Disconnect connectors and
l
make measurements on har- 1
ness side.
Continuitybetween thefollowing
l
OK: Continuity provided
HU side ABS valve relay side
2 - 4
OK
E-12
Check trouble symptoms.
Replace ABS valve relay.
Check harness between ABS valve
NG
c-94, A-80
Replace HU.
A-65, A-80
N G
Replace A&-ECU.
Probable cause
l
Harness, connector defective
l
HU defective
l
ABS-ECU defective
l
Check harness between ABS valve
Check harness between HU and
ABS-ECU, and repair if necessary.
Check harness between HU and
ABS valve relay, and repair if
necessary.